KR101054056B1 - Expansion valve - Google Patents

Abstract

The present invention aims to simplify the structure of the refrigerant expansion valve mounted to the air conditioner and to reduce the assembly labor. The expansion valve 1 has a columnar valve body 10, the valve body 10 includes a first passage 20 through which refrigerant is introduced, a valve chamber 22 formed near the bottom of the passage, A second passage 24 of refrigerant directed to the evaporator and a third passage 26 of refrigerant returning from the evaporator are formed. The valve member 30 installed in the valve chamber is operated by the power element 70 through the operating rod 60. The expansion valve is assembled by injecting the assembly of the orifice member 40 and the assembly of the guide member 100 into the opening provided in the valve body 10.

Expansion valves, valves, refrigerants, diaphragms, air conditioners

Description

Expansion valve {EXPANSION VALVE}

1 is a cross-sectional view of an expansion valve of the present invention.

2 is a right side view.

3 is a perspective view of the dustproof member.

Description of the Related Art [0002]

1: expansion valve

10: valve body

20: passage of refrigerant from the compressor

22: valve chamber

24: passage of refrigerant to the evaporator

26: passage of refrigerant returning from the evaporator

30: valve member

40: orifice member

50: dustproof member

60: working rod

70: power element

80: diaphragm                 

90: stopper member

100: guide member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve mounted on an air conditioner such as an automobile air conditioner and controlling a flow rate of a refrigerant supplied to an evaporator in response to a refrigerant temperature.

An example of this type of expansion valve is described in Japanese Laid-Open Patent Publication No. 2000-304381.

In a conventional expansion valve, components such as a valve support member, a spring, and an adjustment screw are required, making it difficult to achieve miniaturization and light weight of the expansion valve.

In addition, there is a risk that the refrigerant leaks through the adjusting screw portion in the valve chamber.

The expansion valve of the present invention, as a basic means, has a valve body, a first passage formed in the valve body and through which a high pressure refrigerant passes, and an opening formed at the top of the valve body and communicating with the first passage. A valve chamber with a bottom, a second passage formed in the valve body in parallel with the first passage and passing through the evaporator, and a third passage formed in the valve body and through which the refrigerant passed through the evaporator passes And an orifice member having a throttle passage communicating the valve chamber with the second passage, and being pressed into the opening of the valve chamber, a valve member disposed opposite the orifice member in the valve chamber, and operating the valve member. And a first rod which communicates with the actuating rod to communicate with the second passage and the third passage of the valve body. A guide member for guiding to slide freely, and a driving device provided in the valve body and installed in a second opening communicating with the third passage to drive the operating rod, wherein the inner diameter of the second opening is It is larger than the inner diameter of the first opening, the inner diameter of the first opening is larger than the inner diameter of the opening of the valve chamber, and the valve member, the orifice member, the guide member, the operating rod and the driving device It is possible to assemble from the upper end side of the valve body.

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Moreover, the valve member is fixed to the valve support member and has a spring provided between the valve support member and the bottom of the valve chamber.

1 is a cross-sectional view of the expansion valve of the present invention, Figure 2 is a right side view. The expansion valve shown in its entirety with reference numeral 1 has a valve body 10 having a foot shape made of aluminum alloy or the like, and the valve body 10 is provided with a first passage 20 through which a high-pressure refrigerant flows. The first passage 20 penetrates the valve chamber 22 with the bottom, and the orifice member 40 is press-fitted to the opening of the valve chamber 22.

In the valve chamber 22, a spherical valve member 30 is attached to the support member 32 by welding, and the support member 32 always orifices the valve member 30 by a spring 34. Force is directed to the member 40.

The orifice member 40 has an opening portion 42 in the center thereof and forms a flow path of the refrigerant between the valve member 30. The dustproof member 50 is fitted in the inner diameter portion of the orifice member 40 to prevent vibration of the valve member.

The refrigerant passing through the orifice member 40 is sent out from the second passage 24 to the evaporator. The refrigerant returning from the evaporator goes through the third passage 26 to the compressor.

At the end opposite to the valve chamber 22 of the valve body 10 is attached a drive member 70 of a valve member called a power element. The power element 70 has a cap 72 in which the upper cover 72a and the lower cover 72b are integrally welded, and a diaphragm 80 is fitted between the upper cover 72a and the lower cover 72b. The cap 72 is fixed to the valve body 1 at the threaded portion 74 and sealed with the sealing member 76. A pressure chamber 82 is formed between the diaphragm 80 and the upper lid 72a, the working fluid is filled, and closed by a stopper 84.

The stopper member 90 abuts against the pressure chamber 82 of the diaphragm. Refrigerant in the third passage is introduced into the back surface of the stopper member through the opening 12. The stopper member 90 slides in accordance with the displacement of the diaphragm 80. The stopper member 90 has an operating rod 60, and the tip of the operating rod abuts the valve member 30. The displacement of the diaphragm 80 drives the valve member 30 via the operating rod 60 to control the flow path area between the diaphragm 80 and the orifice member 40.

The guide member 100 press-fitted into the valve body 10 has a stepped portion 110, and is accurately positioned and fixed with respect to the valve body 10. A ring-shaped sealing member 120 is inserted into the inner diameter portion of the guide member 100 and fixed by a locking tool 130 such as a push nut. The sealing member 120 seals the passage of the refrigerant between the second passage 24 and the third passage 26.

3 is a perspective view showing the structure of the dustproof member 50. The dustproof member 50 has a ring portion 52 in which a highly elastic metal plate is curved in a circle, and a cage 54 formed by cutting the ring portion and bending it inward.

Both ends 52a and 52b of the ring portion 52 are made to overlap each other, and are inserted into the inner diameter of the orifice member 40 in a state in which the diameter of the ring portion 52 is reduced, and is dust-proofed by using an elastic force to restore the diameter. The member 50 can be positioned and engaged inwardly of the orifice member 40.

The cage 54 abuts against the outer circumference of the spherical valve member 30 to control the vibration of the valve member 30.

In this embodiment, three cages 54 are provided, but four cages may be provided.

Next, the assembly procedure of the expansion valve will be described.

First, the support member 32 to which the spring 34 and the valve member 30 are welded is opened, and the opening 12 (ie, the second opening) on the side to which the power element 70 is attached to the valve body 10 is first opened. Through the bottom of the valve chamber 22.

Next, the assembly of the orifice member 40 to which the vibration isolating member 50 is attached is inserted from the opening 12 to press into the opening 16 formed at the upper end of the valve chamber 22.

This press fit is fixed by performing a caulking process using an appropriate press tool.                     

Next, the guide member 100 into which the operating rod 60 is inserted is inserted from the opening 12 and press-fitted into the stepped hole 14 of the valve body 10. The guide member 100 is positioned in the axial direction by the stepped portion 100. If necessary, it is caulked and fixed.

Finally, the assembly of the power element 70 is screwed into the valve body 10 by the threaded portion 74 to complete the assembly of the expansion valve.

 As mentioned above, the expansion valve of this invention forms the opening part of the valve chamber with the 1st opening part whose inner-diameter dimension becomes small gradually from the 2nd opening side which attaches a power element with respect to the main body of an expansion valve, and the front end part is a bottom part. With the holes. An assembly of a valve member or an orifice member is attached to the opening to form a valve chamber. The assembly of the guide member is press-fitted to guide the operating rod to partition the high pressure side and the low pressure side passages of the refrigerant.

By such a configuration, the number of parts of the expansion valve can be reduced, thereby reducing the number of assembly operations.

Claims (3)

A valve chamber having a valve body, a first passage formed in the valve body and through which a high pressure refrigerant passes, a valve chamber formed in the valve body and communicating with the first passage and having an opening at an upper end thereof; A second passage formed in parallel with the first passage and passing through the refrigerant discharged to the evaporator side; a third passage formed in the valve body and passed through the refrigerant discharged from the evaporator side; and the valve chamber and the second passage. An orifice member having a throttle passage communicating with each other, press-fitted into the opening of the valve chamber, a valve member disposed opposite the orifice member in the valve chamber, an operating rod for operating the valve member, and the valve body. It is press-fitted into the 1st opening which communicates a 2nd passage and a 3rd passage, and it is made to slide | move freely the said operating rod. And a driving device formed in the valve body and installed in the second opening communicating with the third passage to drive the operating rod, wherein the inner diameter of the second opening is the inner diameter of the first opening. It is larger than the dimension, and the inner diameter dimension of the said 1st opening part is larger than the inner diameter dimension of the said opening part of the said valve chamber, The valve member, the orifice member, the said guide member, the actuating rod, and the said drive device are the upper side of the said valve main body. And an anti-vibration member for preventing vibration of the valve member from an inner diameter portion of the orifice member. delete The expansion valve according to claim 1, wherein the valve member is fixed to the valve support member and has a spring provided between the valve support member and the bottom of the valve chamber.

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